1972 - Subsec. (b). Pub. L. 92-473, Sec. 3(a), excluded section 358 of this title from being subject to Secretary's authority to provide limitations and to make regulations respecting application of provisions of this chapter, substituted ''but only in special circumstances where he determines that such limitation, variation, tolerance, or exemption is necessary and proper'' for ''as he may find necessary and proper'', and authorized administrative action in accord with the remedial purpose of this chapter to protect prevailing labor standards.

Subsecs. (c), (d). Pub. L. 92-473, Sec. 3(b), added subsecs. (c) and (d)